Method for making plaster-board lath



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J. SCHUMACHER METHOD FOR MAKING PLASTER BOARD LATH Filed Aug. 6. 1923' 4 Sheets-Sheet lid till) Patents ar. 25, 192d.

' @lF' 'S lhddhddtl JOHN SCHUMACHER, 015 LOS. ANGELES, CALIFORNIA.

METHOD F93 MAKING PLASTERFBOARD LATE.

Application filed August 6, 1923. Serial No. 656,011. I

7 '0 all whom it may concern.

Be it known that I, JOHN Sonmuaonnn, a citizen of the United States, and resident of Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in a Method for Making Plaster-Board Lath, of which the following is a specification.

This invention relates to an improved process or method of making plaster board lath having pockets in a surface thereof. The article to be manufactured by the process herein disclosed is especially adapted for use in building constructions wherein a cementitious wall coat is applied to the lath. The specific article disclosed herein consists of a body or a filler of cementitious material disposed between spaced sheets of paper or like material. It is the primary object of this invention to provide a process which is inexpensive, expeditious, simple in number of steps, and which permits the green prod not to be easily handled, cut, trimmed, and cured.

The features of a particular apparatus for carrying out the present invention is shown in the drawings. However, the process is in no way limited to the utilization of the particular apparatus shown herein. In the drawings:

Fig. 1 is a side elevation partly in section of an apparatus suitable for carrying out the process or method; Fig. 2 is a section on an enlarged scale showing a fragment of the conveyer and, forming rollers; Fig. 2 is a view similar to Fig. 2 showing a modification of the forming rollers; Fig. 3 is a face view of a fragment of a slab of plaster board lath made in accordance with the present invention; Fig. d is an enlarged fragmentary view looking in the direction of the arrow 4: in Fig. 1; Fig. 5 is a section showing another modification of the forming rollers; Fig. 6 is a fragment of a slab madewith the rollers shown in Fig. 5; Fig. 7 is a front elevation of the structure shown in Fig. 5; Fig. 8 is a further modification of the forming rollers; and Fig. 9 is a perspective view of one of the rollers shown in Fig. 8.

Referring more particularly to Fig. 1, a hopper for supplying the plastic filler is indicated by A. A mixing means for the composition is indicated by B and may consist of a trough in which are mounted rotatable mixing blades. C and D designate paper supply rolls which furnish the covermg sheets for the plaster board. The forming and spreading means is indicated generally by E. The advancin means or conveyer for the plaster board 1s indicated generally by F. At the discharge end of the conveyer a truck to receive the successively severed portions of the plaster board is indicated by G. The apparatus just described is similar to apparatus well known in the art of making plaster board, except for the forming and spreading means, and a type thereof is particularly described in Patent 1,176,322, granted to John Schumacher and Joseph E. Schumacher, March 21, 1916.

In accordance with the present invention, the paper which is preferably slowly permeable by moisture is fed from the rolls C and D and the plastic filler is fed between the strips of paper. The operation is continuous. As the green plaster board is advanced by the conveyer, it is cut into suitable lengths, and delivered to trucks G, where it is stacked. The usual steps follow of allowing the plaster board to set and thereafte drying the slabs in a kiln.

The article formed by the present process is a plaster board lathhaving one covering sheet cut to provide tongues and pockets formed in the ody. Referring particularly to Figs. 3 and 6, the top sheet 10 has tongues 11 cut therein. The tongues are depressed into the body of the filler so as to form pockets. The conveyor comprises an endless belt 13 driven by a suitable earing. The strip of paper 12 passes from tdie roll C onto the conveyer and is moved toward the truck G. llt passes beneath the guide box 1 1 and beneath the forming and spreading mechanism. The strip 10 passes from the roll ID between the forming rollers 15 audit. The roller 16 has trunnions, one of which indicated by 17 is mounted in a journal block 18.

The blocks 18 are slida ly mounted in frames 19 disposed on opposite sides of the machine. Fotatably connected to blocks 18 are adjustment rods 20, which are threaded at the upper ends and are disposed in threaded sleeves 21 formed upon the frame. Hand cranks 22 are connected to the ends of the adjustment rods so that the latter may be rotated and the blocks 18 raised and lowered to adjust the position of the forming roller 16. Disposed above the roller 16 is a forming roller 15 having trunnions 23 mounted in blocks 24. The journal blocks 24: are slid'ably mounted in the frame 19 and are connected to the blocks 18 by means of tension springs 25. Thus, the rollers 15 and 16 are pressed toward each other by the springs. Roller 16 is formed with hooked teeth 26. The teeth are so arranged upon this roller that the tops thereof trail in the direction of rotation of the roller. In the structure shown in Figs. 2 and 4, the teeth all trail and the teeth'in adjacent rows are staggered. In the alternate rows, the teeth are in line with each other, and roller 15 is provided with grooves 27 for the lines of teeth to enter. The strip of paper 10 being passed between the rollers 15 and 16, will be cut or slit to form tongues, as will be apparent from an inspection of Fig. 2. It is then carried downwardly around and beneath the roller 16. The plastic composition is fed from the hopper A into the box 14 and is spread by the roller 16 to produce the proper thickness of the plaster board. The tongues are forced inwardly, the teeth 26 roduce the ockets.

. n Fig. 2, t e roller 16* is shown with a row of teeth 28 which are reversed and l ad instead of trail. In Fig. 5, a form is shown wherein the pockets 11 in a roller are closer together as shown in Fig. 6 and the edges of the pockets are all in line. With this a grooved roller cannot be used, and roller 15 is provided with concave recesses 29. In this type of construction it is necessary to have the recesses in roller 15" and the teeth on roller 16 mesh. To this end, the rollers are positively geared together and such construction is shown in Fig. 7, wherein the rollers are provided with gears 30 and 31 meshing with one another.

In Fig. 8, a roller 15 is shown wherein longitudinal slots are provided. form the roller may be made by connecting head 32 with slats 33. Thus, a hollow slotted roller is provided. Theteeth on roller 16 enter the slots and cut tongues in the sheet 10 therebetween as will be apparent from the drawing.

The advantage of the present method consists primarily in the single handling of the materialsto formagreen plaster board lath. The tongues are cleanly cut in the dry paper and depressed. The sheets are advanced with the tongues maintained depressed and pockets formed as the filler is spread therebetween. The remaining steps are the usual ste s in making plaster board.

at I claim is:

1. The process of making plaster board lath having a plurality of ockets adapted to receive intruding portions of a plaster In this coat in interlocking relation, which consists in advancing strips of covering sheets, slitting pocket opemngs in one of said sheets during its advance, supplying plastic filler betweensaid sheets during their advance, and expressing said filler at said pocket openings.

2. The process of making plaster board lath having a plurality of pockets adapted to receive intruding portions of a plaster coat in interlocking relation, which consists in advancing strips of covering sheets, projecting penetrating forms through one of said sheets during its advance so as to slit pocket openings therein, supplying plastic filler between said sheets and maintaining said penetrating forms in position during the supply of said lastic filler so as to form pockets in said board.

3. The process of making plaster board lath having aplurality of pockets adapted to receive intruding portions of plaster coat in interlocking relation, which consists in advancing strips of covering sheets, slittin tongues in one of said sheets during its a vance, supplying plastic filler between said sheets, and expressing said filler by depressifililg said tongues during the advance of said 4. The process of making plaster board lath having a plurality of pockets adapted to receive intruding portions of a plaster coat in interlocking relation which consists in advancing strips of covering sheets, projecting penetrating forms through one of said sheets during its advance so as to slit tongues therein, supplying plastic filler between said sheets and maintaining said penetrating forms in position during the supply of said plastic filler so as to depress said tongues and form pockets.

5. The process of making plaster board lath having a plurality of pockets adapted to receive intruding portions of a plaster coat in interlocking relation which consists in advancing strips of covering sheets, passing one of said sheets under a forming roller having projections so as to slit pocket openings therein, supplying plastic filler during the advance of said strips so that said projections will form pockets in said board.

.6. The process of making plaster board lath having a plurality of pockets adapted to receive intruding portions of a plaster coat in interlocking relation which consists in advancing strips of covering sheets, passing one of said sheets under a forming to receive intruding portions of a plaster coat in interlocking relation, which consists in advancing strips of covering sheets, passing one of said sheets under a forming roller having projections with trailing tops so as to slit tongues therein, supplying plastic filler during the advance so that the pr0jections on said roller Will depress said tongues and express said plaster forming pockets, each pocket having an undercut wall.

In witness that I claim the forgoing I have hereunto subscribed my name this 28th day of July, 1923.

JOHN SCHUMACHER. 

